# Thread: Math help. +rep

1. ## Math help. +rep

Ah!! Help!!

I'm so freaking lost...

I have (1+cos(y))/(1+sec(y))

I need to simplify it in terms of cos/sin..

I'm stuck.. I don't understand how to get the fraction off..

2. y=3*4^x
y=12*5^x
For 1st one, you see the 3 so you factor that out, and from there its pretty obvious.
For 2nd, since when x is 0, y is 12, that means a = 12. Then from there you can figure out the rest pretty easily.

3. An exponential function f(x)=a⋅bx passes through the points (0, 12) and (3, 1500). What are the values of a and b?

12=a*b^0
12=a

then plug in the second point
(3, 1500)
1500=12*b^3
125=b^3
5=b

a= 12
b=5

---------- Post added at 08:55 PM ---------- Previous post was at 08:47 PM ----------

Do you want the work for number 1?

4. ## The Following User Says Thank You to Ana For This Useful Post:

Ray-Chill (03-12-2012)

5. =] No thanks. Lol My homework is all online so she can't see it anyways. =]
Might have somemore problems later.

6. 8^(8x-3)=5^(10x-6)
Solve for x..

7. My bad :p

8. There are definitely real solutions...

Exact answer is x=(9log(2)-6log(5))/(24log(2)-10log(5))

9. ## The Following User Says Thank You to Zachafer For This Useful Post:

Ray-Chill (03-14-2012)

10. 8^8x-3 = 5^10x-6
(8x-3) * log8 = (10x-6) * log5
(8x-3) * 0.903 = (10x-6) log5
7.242x - 2.709 = 6.99x - 4.194
0.234x = -1.485
x = -6.346

@Ray-Chill, almost the same amswer as Zachafer

11. ## The Following User Says Thank You to Slasher For This Useful Post:

Ray-Chill (03-14-2012)

12. I love you guys.. You have no idea!

Saved my life.

13. Originally Posted by Ray-Chill
I love you guys.. You have no idea!

Saved my life.
No problem. If you need any help in math (or other subjects) around the same level of difficulty you can pm me!

14. ## The Following User Says Thank You to Slasher For This Useful Post:

Ray-Chill (03-14-2012)

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